The Work at Home Institute does provide information about affiliate marketing, which is a legitimate form of making money. However, the information that it provides is available from other sources, usually for free. It is not an accredited educational institute of any sort, nor is it authorized to provide certification.
Some users have noted that Work at Home does honor its money-back guarantee if this is pursued with enough vigor, but the refund process is not well documented enough to be reassuring. The course also under-represents the amount of work and effort required to make money from affiliate marketing, as well as promoting jobs as Search Engine Agents that do not seem to exist.